172372720 has 80 divisors (see below), whose sum is σ = 435909600. Its totient is φ = 63009792.

The previous prime is 172372703. The next prime is 172372721. The reversal of 172372720 is 27273271.

172372720 is nontrivially palindromic in base 12.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172372721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110506 + ... + 112054.

It is an arithmetic number, because the mean of its divisors is an integer number (5448870).

Almost surely, 2^172372720 is an apocalyptic number.

172372720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172372720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217954800).

172372720 is an abundant number, since it is smaller than the sum of its proper divisors (263536880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172372720 is a wasteful number, since it uses less digits than its factorization.

172372720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682 (or 1676 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 172372720 is about 13129.0791756315. The cubic root of 172372720 is about 556.5311936021.

The spelling of 172372720 in words is "one hundred seventy-two million, three hundred seventy-two thousand, seven hundred twenty".